Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..803c&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 803-806
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The baseline optical configurations proposed for the Global Astrometric Interferometer for Astrophysics (GAIA) have an effective focal length of ~12 m (Perryman & Lindegren 1994, Shacklan & Loiseau 1995) appropriate for image location on the focal plane via a modulating grid. To allow direct fringe detection, an effective focal length of 25-30 m is required to sample properly the white interferometric fringes with improved state of the art CCDs. Alternative optical configurations of the GAIA interferometer subject to the requirement above and therefore suitable for direct fringedetection were investigated. In particular, a 4-mirror and 4-reflection (4M/4R) configuration was designed and analysed. This configuration realizes an effective focal length of 25 m due to the introduction of one aspheric surface; this appears sufficient to match the sampling requirement of the fringes which calls for ~2.5 micrometer pixels.
Cecconi Massimo
Gai Marco
Lattanzi Mario G.
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